We evaluate a photon convolution-superposition algorithm used to model a fast neutron therapy beam in a commercial treatment planning system (TPS). The neutron beam modeled was the Clinical Neutron Therapy System (CNTS) fast neutron beam produced by 50 MeV protons on a Be target at our facility, and we implemented the Pinnacle3 dose calculation model for computing neutron doses. Measured neutro...

Fast neutron activation analysis has been applied to bulk carbon detection. DT-neutron generator emitting 14.1 MeV neutrons was used as a source. Prompt 4.44 gammas from the inelastic scattering on were detected using 30% HPGe semiconductor gamma spectrometer shielded primary beam. The sensitivity of experimental setup is discussed. Keywords: Activation analysis; neutrons; Gamma spectrometry.

The teratogenicity of californium-252 (Cf-252) irradiation which generates approximately 70% 2.3 MeV fast neutron and 30% gamma rays was evaluated. A single whole body exposure of Cf-252 at various doses was given to pregnant rats on day 8 or 9 of pregnancy, followed by microscopic autopsy of the fetuses at the terminal stage of pregnancy to search for external and internal malformations. For c...

Previous research has demonstrated that adding a very small gamma-ray dose to a small alpha radiation dose can completely suppress lung cancer induction by alpha radiation (a gamma-ray hormetic effect). Here we investigated the possibility of gamma-ray hormesis during low-dose neutron irradiation, since a small contribution to the total radiation dose from neutrons involves gamma rays. Using bi...

background: monte carlo simulations play a vital role in the calculation of the necessary shielding both for neutrons and photons. advanced and simple shielding materials against neutron and gamma rays were compared by simulation using the mcnb4b monte carlo code. the simulations were carried out for the three common neutron sources, namely the 252cf, the 241am/be and the dd neutron generator w...

We present an application of a digital pulse shape discrimination (PSD) technique for the novel measurement of cross-correlation functions from a spontaneous fission source. The measurement method allows for the collection of fast coincidences within a time window of the order of a few tens of nanoseconds. The use of PSD allows for the accurate acquisition of the coincidences in all particle co...

For the first time we report ability of CLLB scintillator to detect and discriminate fast neutrons (2-10 MeV energy range) from gamma-rays thermal neutrons, using a digital pulse shape discrimination technique. Firstly, conducted measurements in single mode with an Am-Be source, unshielded shielded, tagged new cluster events as neutron-induced zone. The Figure Merit obtained for neutron/gamma w...

Since 2002 the Commonwealth Science and Industrial Research Organisation (CSIRO) has been working with the Australian Customs Service to develop a scanner capable of directly imaging airfreight containers in 1-2 minutes [1-4]. The scanner combines fast neutron and gamma-ray radiography (FNGR) to provide high-resolution images that include information on material composition. By collecting trans...